link...
Sometimes though, especially with the IRQL_NOT_LESS_OR_EQUAL error, even that is not enough. This is where you get hardcore with the troubleshooting. In the BIOS, load Fail-Safe defaults, disable the onboard modem, sound, and LAN (where applicable). Take out all the cards, with the exception of video, and run the machine for a while. If the machine stays stable, then start adding/re-enabling the devices one by one. Keep in mind that modern motherboards share IRQ's across PCI slots, so try not to put a sound card and a modem right next to each other. They don't seem to think that's funny every once and a while. Anyway, do this one by one until you start crashing again. Whatever you put in last is the culprit.
Also, many newer motherboards' northbridges are actively cooled. Almost always by a bushing fan. Bushing fans tend to bind after a while. Since this chip controls the data stream between the RAM, video, and CPU, I'd say it's pretty important. If it's overheating bad things are bound to happen.
I hope this helps some. That is a list of the steps that I go through when I run into this blasted problem. If only the error messages were more specific...
maybe this, I just googled it, not much of an attempt really.